The labia minora (singular: labium minus), also known as the inner labia, inner lips, vaginal lips, or nymphae,[1] are two flaps of skin on either side of the human vaginal opening, situated between the labia majora (outer labia, or outer lips). Inner lips vary widely in size, color, and shape from female to female. They are homologous to male urethra and penile skin.[2]

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The inner lips extend from the clitoris obliquely downward, laterally, and backward on either side of the vulval vestibule, ending between the bottom of the vulval vestibule and the outer lips. The posterior ends (bottom) of the inner lips are usually joined across the middle line by a fold of skin, named the frenulum labiorum pudendi ("frenulum of labia minora") or fourchette.

On the front, each lip divides into two portions. The upper part of each lip passes above the clitoris to meet the upper part of the other lip—which will often be a little larger or smaller—forming a fold which overhangs the glans clitoridis; this fold is named the preputium clitoridis. The lower part passes beneath the glans clitoridis and becomes united to its under surface, forming, with the inner lip of the opposite side, the frenulum clitoridis.

From 2003 to 2004, researchers from the Department of Gynaecology, Elizabeth Garret Anderson Hospital in London, measured the labia and other genital structures of 50 women from the age of 18 to 50, with a mean age of 35.6. The results were:[3]